Tech test

Scenario

We want to buy an iPhone X, and we are saving our spare money to do so. We have a box at home where we put our spare change every day and need a way to track this (in a geek way).

Requirements

Write a REST API that allows you to:
- Add an amount to the balance of the box.
- Retrieve the total balance.
- Retrieve a history of the transactions.
Use Symfony 4 + Flex for the API.
Use a local development environment, such as PHPs built in server, Symfony server, Vagrant, or Docker for providing access to the API.
Use a local storage technique (CSV, SQLite, …) to save the data in the event store.

Valued aspects

We will evaluate different aspects of the application. Such as

The architecture chosen to solve the problem.
Specific Event Sourcing domain terminology used (For example, the use of Projections).
Usage (or not) of CQRS design pattern.
Usage (or not) of an Event Bus (Event driven design).
Commit history and organisation.
Clean and legibility of the code.
Algorithm complexity used to solve the problem. (Big O)

Don't overcomplicate yourself. Maybe a simpler approach, is more elegant and easier to understand and read. The aspects that say or not are only there to hint you where you can move towards.

Extra information

Valuable resources of information for the task.

Usage

First things first:

composer install

Run your local php server:

php -S 127.0.0.1:8000 -t public

Now you can use your favorite tool to send POST requests to add money to the savings:

curl -X POST -d '{"amount": 1234}' http://localhost:8000/savings

To get the total amount in savings:

curl http://localhost:8000/savings/total

And finally, to retrieve the history of events: